Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
  • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
  • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D213/61—Halogen atoms or nitro radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C233/00—Carboxylic acid amides
  • C07C233/64—Carboxylic acid amides having carbon atoms of carboxamide groups bound to carbon atoms of six-membered aromatic rings
  • C07C233/67—Carboxylic acid amides having carbon atoms of carboxamide groups bound to carbon atoms of six-membered aromatic rings having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by singly-bound oxygen atoms
  • C07C233/68—Carboxylic acid amides having carbon atoms of carboxamide groups bound to carbon atoms of six-membered aromatic rings having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by singly-bound oxygen atoms with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom
  • C07C233/69—Carboxylic acid amides having carbon atoms of carboxamide groups bound to carbon atoms of six-membered aromatic rings having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by singly-bound oxygen atoms with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom of an acyclic saturated carbon skeleton

Definitions

• the present invention relates to a novel process for the preparation of N-[2-(2- pyridinyl)ethyl]carboxamide derivative which is useful as pesticide compound, starting with a halogenobenzoyl derivative to produce a N-acetoxymethylcarboxamide derivative and then coupling it with a 2-pyridyl acetate derivative.
• Patent application WO 2004/016088 discloses the preparation of N-[2-(2-pyridinyl)ethyl]benzamide derivatives starting from 2-halogenopyridine derivatives to produce 2-ethylaminopyridine derivatives and then coupling these 2-ethylaminopyridine derivatives with a halogenobenzoyl derivative.
• the present invention relates to a process for the preparation of a N-[2-(2- pyridinyl)ethyl]carboxamide derivative of general formula (I) or a salt thereof
• - p is an integer equal to 1, 2, or 3;
• - X is the same or different and is a hydrogen atom, a halogen atom, a Ci-Cs-alkyl, a Ci-Cs- halogenoalkyl having 1 to 5 halogen atoms;
• R 2 is a hydrogen atom or a cyclopropyl group
• - A represents a phenyl group being optionally substituted by one or more substituents chosen independently of each other as being a halogen atom, a Ci-Cs-alkyl, a Ci-Cs-halogenoalkyl having 1 to 5 halogen atoms;
• Hal 1 or Hal 2 represent independently from each other a halogen atom
• R 3 and R 4 represent independently from each other a Ci-C6-alkyl
• X, R 1 , R 2 , R 3 , R 4 , Hal 1 , X, p and A are as defined above;
• Cation + represents Li + , Na + , K + , Mg 2+ , Ca 2+ , Al 3+ ; comprising the reaction of a N-acetoxymethylcarboxamide derivative of formula (V) with a malonic dialkyl ester pyridyl derivative of formula (IV) or salts thereof in a solvent to provide a 2- pyridylethylcarboxamide derivative of formula (VI); (Q- a third step according to scheme 3:
• R 1 , R 2 , R 3 and R 4 , Hal 1 , A, X, p are defined as above;
• Cation + represents Li + , Na + , K + , Mg 2+ , Ca 2+ , Al 3+ ; comprising the saponification of the 2-pyridylethylcarboxamide derivative of formula (VI) obtained in step B according to scheme 2 in the presence of a base into a compound of general formula (VII)
• R 1 , R 2 , Hal 1 , A, X, p are defined as above;
• Cation + represents Li + , Na + , K + , Mg 2+ , Ca 2+ , Al 3+ .
• VI 2-pyridylethylcarboxamide derivative of general formula (VII) obtained in step C according to scheme 4 into a compound of general formula (I).
• halogen atom may be a bromine atom, a chlorine atom, a iodine atom or a fluorine atom.
• halogen atom means chlorine or fluorine atom;
• an alkyl group, an alkenyl group, and an alkynyl group as well as moieties containing these terms, can be linear or branched;
• a compound used in "catalytic quantity” means that a compound is used in an amount of 0,01 to 0,2 molar equivalent, preferably from 0,01 to 0,1 molar equivalent of the respective reagent or intermediate compound.
• the 2-pyridyl moiety may be substituted in any position by (X) P , in which X and p are as defined above.
• the present invention relates to the preparation of N-[2- (2-pyridinyl)ethyl]carboxamide derivative of general formula (I) in which the different characteristics may be chosen alone or in combination as being :
• p is 1, 2 or 3.
• p is 1.
• X is chosen, independently of the others, as being a halogen atom, a Ci-C t-alkyl or a Ci- C t-halogenoalkyl having 1 to 5 halogen atoms. More preferably, X is chosen, independently of the others, as being chlorine or CF3;
• the 2-pyridyl moiety is substituted by X in 4- and/or in 5-position.
• the 2-pyridyl moiety is substituted by X in 5- position.
• the "ethylamide” part of the compound of formula (I) is substituted by R 1 and R 2 , R 1 and R 2 being as defined above.
• the present invention relates to the preparation of N-[2-(2- pyridinyl)ethyl]benzamide derivative of general formula (I) in which the different characteristics may be chosen alone or in combination as being :
• R 1 is a hydrogen atom, a methyl group, CF3, CHF2, CCIF2 or CCI3. More preferably, R 1 is a hydrogen atom;
• R 2 is a hydrogen atom.
• the present invention relates to the preparation of N-[2-(2-pyridinyl)ethyl]carboxamide derivative of general formula (I) in which A is a phenyl group and in which the different characteristics may be chosen alone or in combination as being :
• each substituent is chosen, independently of the others, as being a hydrogen atom, a halogen atom, a Ci-C t-alkyl or a Ci-C/t-halogenoaikyl having 1 to 5 halogen atoms. More preferably each substituent is chosen, independently of the others, as being chlorine or CF3;
• step A may be conducted in the following conditions, chosen alone or in combination
• the ratio of the halogenopyridyl derivative of formula (II) to the malonic dialkyl ester of formula (III) may be 1 : 10, preferably 1 : 5, more preferably 1 : 2, most preferably between 1 : 1 and 1 : 1.2.
• the malonic dialkyl ester derivative may also be present as a salt.
• the base is chosen as being sodium hydrogen carbonate, sodium carbonate, sodium bicarbonate, sodium methanolate, sodium ethanolate, sodium acetate, sodium hydroxide, potassium hydrogen carbonate, potassium carbonate, potassium bicarbonate, potassium methanolate, potassium ethanolate, potassium acetate, potassium hydroxide, magnesium hydrogen carbonate, magnesium carbonate, magnesium bicarbonate, magnesium methanolate, magnesium ethanolate, magnesium acetate, magnesium hydroxide, calcium hydrogen carbonate, calcium carbonate, calcium bicarbonate, calcium methanolate, calcium ethanolate, calcium acetate, calcium hydroxide, aluminum hydrogen carbonate, aluminum carbonate, aluminum bicarbonate, aluminum methanolate, aluminum ethanolate, aluminum acetate, aluminum hydroxide.
• the base is chosen as being sodium carbonate, sodium methanolate, sodium ethanolate, sodium acetate, sodium hydroxide, potassium carbonate, potassium methanolate, potassium ethanolate, potassium acetate, potassium hydroxide, magnesium carbonate, magnesium methanolate, magnesium ethanolate, magnesium acetate, magnesium hydroxide, calcium carbonate, calcium methanolate, calcium ethanolate, calcium acetate, calcium hydroxide, aluminum carbonate, aluminum methanolate, aluminum ethanolate, aluminum acetate, aluminum hydroxide.
• the base is chosen as being sodium hydroxide, sodium carbonate, potassium hydroxide, or potassium carbonate.
• different bases can be used in combination with each other, for example sodium hydroxide and potassium hydroxide; sodium carbonate and potassium carbonate.
• the temperature of step A is chosen from 0°C to 200°C, preferably from 0°C to 150°C, and most preferably from 0°C to 100°C. Preferred is a temperature of 20°C to 90°C.
• step (A) is performed under reduced pressure.
• the second step (step B) of the process according to the present invention comprises the reaction of a N-acetoxymethylcarboxamide derivative of formula (V) with a malonic dialkyl ester pyridyl derivative of formula (IV) or salts thereof in a solvent to provide a 2-pyridylethylcarboxamide derivative of formula (VI).
• step B may be conducted in the following conditions, chosen alone or in combination :
• N-acetoxymethylcarboxamide derivative of formula (V) may be added to the reaction solution in situ or in solution.
• the malonic dialkyl ester pyridyl derivative of formula (IV) or salts thereof in a solvent may be added to the N-acetoxymethylcarboxamide derivative of formula (V).
• the solvent of step B may be the same or different than the solvent of step A.
• An acid may be present in step B.
• the ratio of N-acetoxymethylcarboxamide derivative of formula (V) to the malonic dialkyl ester pyridyl derivative of formula (IV) may be 10 : 1, preferably 5 : 1, more preferably 2 : 1 and most preferably 1 : 1.
• the acid may be chosen as being acetic acid or formic acid.
• the solvent is chosen as being an aliphatic solvent, an alicyclic solvent, an aromatic hydrocarbon solvent, a halogenated hydrocarbon solvent, an ether solvent, an amide solvent or an urea solvent. More preferably, the organic solvent is chosen as being petroleum ether, hexane, heptane, cyclo-hexane, methyl-cyclohexane, benzene, toluene, xylene, decalin, chloro-benzene, dichloro-benzene, trifluoromethyl benzene, dichloromethane, chloroform, carbon tetra-chloride, di-chloroethane, tri- chloro-ethane, diethyl ether, diisopropyl ether, methyl tert-butyl -ether, methyl tert-amyl-ether, dioxane, tetrahydrofuran, 1,2-di-methoxy ethane, 1,2-di
• organic solvent chosen from the group comprising ⁇ , ⁇ -dimethyl acetamide (DMAC), N- methyl-pyrrolidone, dimethyl carbonate, diethyl carbonate, l,3-dioxolan-2-one (Ethylene Carbonate), 4- Methyl-l,3-dioxolan-2-one (Propylene carbonate).
• DMAC ⁇ , ⁇ -dimethyl acetamide
• N- methyl-pyrrolidone N- methyl-pyrrolidone
• dimethyl carbonate diethyl carbonate
• l,3-dioxolan-2-one Ethylene Carbonate
• 4- Methyl-l,3-dioxolan-2-one Propylene carbonate
• the solvents in step (B) can be used in mixture with other solvents, eg toluene.
• the temperature of step B is chosen from 0°C to 200°C, preferably from 0°C to 175°C, and most preferably from 0°C to 150°C. Preferred is a temperature between from 20°C to 130°C.
• step B The reaction of step B may be performed under reduced pressure.
• step C of the process according to the present invention comprises the saponification of the 2-pyridylethylcarboxamide derivative of formula (VI) obtained in step B to provide the compound according to formula (VII).
• step C may be conducted in the following conditions, chosen alone or in combination:
• the saponification may be performed in a) a two-phase system, b) an one-phase system or c) in the absence of solvent.
• the two-phase system may comprise the aqueous solution of the base and the compound according to formula (VI) in an apolar solvent, the aqueous and the apolar solution being present each as one phase.
• the one-phase system may comprise the base and the compound according to formula (VI) within one phase.
• reaction in step C may use the salt of the compound according to formula (VII) as a catalyst or emulgator. In another embodiment the reaction in step C may convert the compound according to formula (VI) to the compound according to formula (VII) in a molten state.
• the molten state refers to the compound according to formula (VI) in the absence of a solvent at a temperature above the melting point of the compound according to formula (VI).
• the temperature of step C, variant a) is chosen from 0°C to 100°C, preferably from 10°C to 100°C, and most preferably from 10°C to 50°C.
• step C, variant b) is chosen from 0°C to 100°C, preferably from 10°C to 100°C, and most preferably from 10°C to 50°C.
• the temperature of step C, variant c) is chosen from 20°C to 150°C, preferably from 20°C to 100°C, and most preferably from 20°C to 80°C. In one embodiment the temperature is chosen between 40 to 100°C.
• the base is chosen as being an alkaline earth metal base, a hydroxide base, an alcoholate base, an acetate base, a carbonate base, a hydrogen carbonate base, or an organic base.
• the base is chosen as being lithium hydrogen carbonate, lithium carbonate, lithium bicarbonate, lithium methanolate, lithium ethanolate, lithium acetate, lithium hydroxide, sodium hydrogen carbonate, sodium carbonate, sodium bicarbonate, sodium methanolate, sodium ethanolate, sodium acetate, sodium hydroxide, potassium hydrogen carbonate, potassium carbonate, potassium bicarbonate, potassium methanolate, potassium ethanolate, potassium acetate, potassium hydroxide, ammonium hydrogen carbonate, ammonium carbonate, ammonium bicarbonate, ammonium methanolate, ammonium ethanolate, ammonium acetate, ammonium hydroxide, magnesium hydrogen carbonate, magnesium carbonate, magnesium bicarbonate, magnesium methanolate, magnesium ethanolate, magnesium acetate, magnesium hydroxide, calcium hydrogen carbonate, calcium carbonate, calcium bicarbonate, calcium methanolate, calcium ethanolate, calcium acetate, calcium hydroxide, aluminum hydrogen carbonate, aluminum carbonate, aluminum bicarbonate, aluminum methanolate, aluminum
• the base is chosen as being sodium carbonate, sodium methanolate, sodium ethanolate, sodium acetate, sodium hydroxide, potassium carbonate, potassium methanolate, potassium ethanolate, potassium acetate, potassium hydroxide, magnesium carbonate, magnesium methanolate, magnesium ethanolate, magnesium acetate, magnesium hydroxide, calcium carbonate, calcium methanolate, calcium ethanolate, calcium acetate, calcium hydroxide, aluminum carbonate, aluminum methanolate, aluminum ethanolate, aluminum acetate, aluminum hydroxide.
• mixtures of bases may be used.
• different bases can be used in combination with each other, for example sodium hydroxide and potassium hydroxide; sodium carbonate and potassium carbonate.
• the organic solvent is chosen as being an aliphatic solvent, an alicyclic solvent, an aromatic hydrocarbon solvent, a halogenated hydrocarbon solvent, an ether solvent, an amide solvent, nitrile solvents, alcohols, water or an urea solvent.
• the organic solvent is chosen as being petroleum ether, hexane, heptane, cyclo-hexane, methyl-cyclohexane, benzene, toluene, xylene, decalin, chloro-benzene, dichloro-benzene, trifluoromethyl benzene, dichloromethane, chloroform, carbon tetra-chloride, di-chlorethane, tri-chlor- ethane, diethyl ether, diisopropyl ether, methyl tert-butyl -ether, methyl tert-amyl-ether, cyclopentyl- methyl-ether, dioxane, tetrahydrofuran, methyl tetrahydrofuran, 1,2-di-methoxyethane, 1,2-di-efhoxy- ethane, anisole, N,N-dimethyl-formamide, ⁇ , ⁇ -d
• the compound of general formula (I) according to the present invention can be prepared according to the above described process. It will nevertheless be understood that, on the basis of his general knowledge and of available publications, the skilled worker will be able to adapt this method according to the specifics of each of the compounds, which it is desired to synthesise.
• Step B Synthesis of Dimethyl [2-(benzoylamino)ethyl][3-chloro-5-(trifluoromethyl)pyridin-2- yl]malonate Acetic acid was added to a suspension of dimethyl [3-chloro-5-(trifluoromethyl)pyridin-2-yl]malonate of formula (IV-a) of step (A) at a temperature of 60 degree Celsius.
• step (B) For additional amounts of the product of step (B) as MTBE solution together with additional sodium hydroxide and water are added to the reaction mixture comprising the compound according to formula (Vll-a) at 35 degree Celsius. Water is added to dissolve the sodium salt of compound (Vll-a), the MTBE is removed by distillation under reduced pressure.

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